I have read here among the threads that the measured impedance of the AMT 1 series the "great heil" is about 4 ohms. However, I keep hearing about some AMT 1's that are 8 ohms. I have a pair of AMT 1's and the measured DC resistance is about 6 ohms. Is it possible to have a 4 ohm AMT with a measured DC resistance higher than it's impedance or do I in all likely hood have 8 ohm AMT's? I've included the original graph I found posted here. To add to the confusion I called Orange county speaker repair , who sell replacement ESS AMT diaphragms and asked them the impedance of the diaphragm. The sales rep said they were 8 ohm as listed in their computer. When I asked her if she could double check she spoke with a tech who said they are actually 4.
So what gives? There's also this ebay item that claims his AMT 1 is 8 ohms.